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Originally Posted by Teegy  In addition, the reproductive and hormonal systems in dogs do not vary from breed to breed, Pyometra doesn't just impact in fixed females, spayed ones can contract it too, not all unfixed females contract it and generally infection tends to attack a weakened immune system. So hopefully with a proper diet and a strong immune system such a life threatening illnesses risks could be kept at bay. |
Not sure where you got this information, but you might want to take a look at this link: Pyometra cannot occur if there is no uterus.
Pyometra: More Than a Uterine Infection While it's true, any illness probably occurs when the immune system is weak, so proper diet, exercise, etc., are important, we really never know what will weaken the immune system and simply getting older could do it.